The Supremacy Clause of the US Constitution generally preempts state laws that conflict with federal law, rendering them void. The federal Controlled Substances Act, which criminalizes the manufacture, distribution, and use of controlled substances, appears to conflict directly with state laws that “legalize” marijuana for recreational or medical purposes.

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Web Site: America's Weed Rush

This investigation of marijuana legalization in America is the 2015 project of the Carnegie-Knight News21 program, a national multimedia investigative reporting project produced by the nation’s top journalism students and graduates.

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